commplex-main on port 5000

yeesh. what is this? My norton's firewall reports this when I am plugged in:
"The program "mDNSResponder" has opened port 5000 on your computer, but your firewall does not allow connections to this port."
It then asks me if I want to change or not. I don't remember that port being opened before. And norton says that the port is being used by commplex-main. This didn't come to my attention before now.

I've done a bunch of research and have come up with very little. In some cases it is apparently not good for Port 5000 to be open because of trojans and sniffers and the such, but i can't get a straight answer andd some sites say it isn't that horrible or it is needed (but they are always referring to windows). I did find a couple of sites that mention "commplex-main" using port 5000, but I still can't find out what it is and if it is important to computing on the internet or if it is in actuality... dangerous.
Yet, with a program name like "mDNSresponder" maybe it is important.

Oh, and apparently when I try to get info on who is using it, it is basically me. And it says that the "IP address belongs to a computer on your local network, therefore there is no public network or domain information".

At the moment I am plugged into a DSL line at my hotel room in Vancouver, BC. I haven't had the Norton's Firewall installed while using wireless, yet, so I don't know if that has something to do with it.

Anything would help me figure this out. And feel better about having that port opened or closed.

thanX

PB 12 G4, greyish silver with a purple aura of doom Mac OS X (10.3.9) it doesn't eat meat, but I do, sometimes, but not often.

PB 12 G4, greyish silver with a purple aura of doom, Mac OS X (10.4), it doesn't eat meat, but I do, sometimes, but not often.

Posted on Sep 10, 2006 10:54 PM

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3 replies

Sep 11, 2006 4:13 AM in response to geoph

from your post sounds a bit like upnp which is on port 5000.
(UPNP is Universal Plug aNd Play), which may have something to do with finding device names on routers, perhaps on your home network?

It's also part of the multicast DNS responder, which is is how Bonjour/Rendezvous works.
http://forums.macrumors.com/archive/index.php/t-146156.html

Probably something to worry less about.
If these alerts are coming from Norton...consider the source. There are lots of things the Norton is unaware of, so try not to depend on that to be your definitive network warning system.

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commplex-main on port 5000

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